With obesity rates in nations around the world blobbing into oblivion, any scheme encouraging us to get off our butts and be more active surely has to be a good thing.

Take the Moscow subway, for example. A special vending machine has been installed at Vystavochaya station in the west of the Russian capital which offers travelers tickets for free rides – so long as they perform 30 squats first. Oh, and just to ensure your heart rate shifts into at least second gear, the task has to be completed within two minutes.

Of course, for those keen to avoid turning up at work stinking of sweat, cash payments (30 rubles/$0.93 for a single journey) continue to be accepted.

The video below shows the new machine in action. While many people seem a bit unsure at first, they soon get into the idea, with travelers of all shapes and sizes managing to score a free ride.ook